Knoxville Weather Forecast

    • 57
    • 73

    Rain Showers Likely

    • 54
    • 64

    Rain Showers Likely

    • 50
    • 63

    Chance Rain Showers

    • 52
    • 65

    Partly Sunny

    • 56
    • 69

    Mostly Cloudy

    • 55
    • 73

    Partly Sunny

Today 20 Sep Knox

Showers likely. Thunderstorms Likely, mainly in the morning. Cooler with Highs in the lower 70s. Northeast Winds 10 to 15 Mph. Chance of rain 70 percent.

Tonight 20 Sep Knox

Cloudy. A chance of Showers and Thunderstorms in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Cooler with Lows in the upper 50s. Northeast Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 50 percent.

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Knoxville Temperature Statistics

September Temperature

Galesburg Municipal Airport (7.5 miles)

  • Lowest 14 September, 2026

    52.3 °F

  • Average September

    73.9 °F

  • Highest 3 September, 2026

    93.6 °F

Climate (2021–2026)

Galesburg Municipal Airport (7.5 miles)

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  • Average Low 2021–2026

    41.9 °F

  • Average 2021–2026

    52.2 °F

  • Average High 2021–2026

    62.5 °F
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